Week of 1/12
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This 2 page Class Notes was uploaded by Caroline Bacevice on Tuesday January 20, 2015. The Class Notes belongs to 1108 at Ohio State University taught by Loren Babcock in Spring2015. Since its upload, it has received 84 views. For similar materials see Gemstones in Earth Sciences at Ohio State University.
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Date Created: 01/20/15
Gemstones Week of 112 What is a Gem Material that is sufficiently attractive and durable to be used for personal adornment Desirable for its beauty What is a precious stone Precious and semiprecious Sometimes used to distinguish harder or more valuable stones from softer or less value stones No uniform criteria All can be referred to as gemstones Key attribute of a gemstone Beauty Beauty is in the eye of the beholderquot May be color brilliance sparkle transparency fire rainbow effect luster or a combination of these factors Faceted gems Faceting enhances the sparkle and brilliance of a gem Facet at and polished surface Facet names Table top facet often largest Crown top of the stone bezel top Girdle edge between crown and pavilion Pavilion lower part of a stone about 23 of stone Culet small facet at bottom Why are gems faceted To take advantage of the behavior of light that passes into a gem o Depends on re ection and refraction of light Re ection bouncing of light off a surface facet Mirror effect Refraction Bending of light as it passes from one substance air into another gem Air and gem have different densities Re ection Bouncing of light off a facet 0 Internal re ection of light within the pavilion is needed to achieve brilliance and sparkle 0 Critical Angle Angle at which total internal re ection is achieved Iflight inside a gem is 0 Inside the critical angle it exits the gem 0 Outside the critical angle it is internally re ected then exits
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